Render documentation examples live with the Playground engine

[konojunya]

Summary

• Render canonical Stack sources on demand with the shared Playground WASM adapter; remove nine pre-rendered SVGs and the thumbnail generator.
• Defer offscreen previews, expose source links without JavaScript, and separate rendering diagnostics from retryable loading failures.
• Display isolated Blob-backed images and release URLs on replacement/navigation; make WASM initialization retryable.
• Sync the four-language gallery explanation from the merged canonical documentation source.

Verification

• 38 UI/unit tests, 17 documentation tests, formatting, lint, complete 60-page build, and deployment dry run.
• Every browser-rendered SVG matches the SHA256 of the same source rendered by the published WASM in Node.
• Chrome desktop and 320px checks; simulated WASM download failure recovered with keyboard retry.
• Guards reject reintroduced static example SVGs; source inventory, engine diagnostics, provider catalog and safe SVG checks remain in CI.

Notes

Provider artwork remains caller-owned; the gallery displays deterministic fallback shapes and exposes diagnostics. No language, theme, or layout algorithm changes.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	stack-web	323e0d8	Commit Preview URL Branch Preview URL	Sep 05 2026, 09:46 PM